Impeller pump or blower and driver therefor.



J. T. WILKIN.

IMPELLER PUMP 0R BLOWER AND DRIVER THEREFOR.

APPLICATION FILED AUG-9, 1915.

1 1 89 76 6 Patented July 4, 1916.

' 2 SHEEIS-SHEET I.

WITNESSES: INVENTOR J. I, WILKIN. IM PELLER PUMP OR BLOWER AND DRIVER THEREFOR.

APPLICATION FILED AUGQ, l9l5.

l'ut'vntod July 4, 1916.

2 SHEETS-SHEET 2 WITNESSES); ,afwxfi m" mp 4m UNITED STATES PATE T-OF I i a JOHN T. WILKIN, OF CONNERSVILLE, INDIANA, ASSt GNOR TO THE CONNERSVILLE BLOWER COMPANY, OF INDIANAPOLIS, INDIANA, AOQRPORATION O)? INDIANA.

IMPE LLER PUMP OR BLOWER AND DRIVER THEREFOR h Specification of Letters Patent. v

7. I Patented July 1916.

Application filed Aiigust 9, 1915. Serial No. 44,380.

mating lobed impellers have their shafts \'Htlll(Hll7.ttl by mating gears and the shaftsare ronunonly driven by the direct coupling of an engine shaft to one of the shafts. .\ueh an installation necessarily requires the use of heavy vm-hronizing gears .beeause said gears transmit the driving force to one of the inipellers and eonsequentlv these heavy gears must have the ends of their shafts supported by a heavy out oard hearing. The. eranklshaft of the engine must also be supported by an outboard bearing. the coupling between the engine crank shaft and one of the shafts of the blower being arr ng d between the two ontboa'rd bearings. Such an arrangement also involves the provision of considerable floor space. esperiallv where a compound engine is used. and. hecause of the power transmission through the gears. larger impeller clearances are required. suchelearanres, of course. reducing the ellirienev of the pump or blower.

In such an installation there is a surging of the driving torque from one pump shaft to the other owiug'to the fact that each impeller oll'ers a variable resistance. this resistance passing through maximunr. and minimum twice in each shaft rotation and this surging of the driving torque produces baek lash in the driving gears.

The object of my present invention is to produce a blower or pump unit of much higher eflicienc than can be obtained by the arrangement (escribed above, eliminating the necessity of heavy drivinggears, out,

board hearings for the shaftsrof these gears,

the outboard bearing of the engine. the con pling between engine and blower Shaft, and the engine shaft, the result being obtained by the direct. application of the cranks of two engines to the two shafts of the pump or blo we r.

. The accompanying drawings illustrate my invention.

Figure aside elevation of my improved combination; Fig. 2 an end eleijz;

l. \VILKIN, a

tlie,aiiangement shown.

tion; Fig. 3 a diagrannnatic section of one form of the blower or pump; and Fig. 4 adiagram showing the load flariations.

In the drawings, 10 indicates a blower 0f the type described comprising the parallel shafts It and llronnectediby thesynrhronizing gears 13 (dotted lines Figs. 1 and 3). lhese gears are preferably arrz'ingcdin pairs at each end of theblower structure, a indieated in Fig. 2. and. because there willbe eomparatively little transmissionof driving force through these gears they may be com..-

paratively light and narrow. Connected to the shaft 11 'is the eranl; lfi (dotted linc's' Figs. t and ll) of a reeipromiting engine l5,

the rranlt beingset in line with the lobe plane of the impeller [Tattaehed to shaft ll. Connected to the shaftl'l. and preferbly upon the opposite side of theblower from engine 15. is a crank 19 which is set in line with the lobe plane of the im )eller :20 \vhirh is carried by shaft. 1; aud t is crank is a part of the engine 21, a companion to engine 15. .\s indicated in Fig. .2. unit '15 may be a high pressure unit and the unit .21 a low pressure unit. ii

Hy referring to Fig. 3, it willbe seen that the maximum resistant'eis being offered by the impeller ill in the. 'position indicated, while the minimum resista'neeis being ifl'ered b v the-impeller IT. The ehar'tetei; of these resi tant-e is indicated by,t ie curves ll aud respeetifelv. in Fig.4, the a verage effect or resistance of tin-two being indicated by curve l. \\'ith reciprocating power units. connected as described. ittyll be seen that the'maxinuun driving effect is being exerted upon the impeller earried by shaft [2, in the position indicated in Fig. 3, while the minimum driving effect of the other power unit is being exertedupon the impeller carried lfys'sl l'aft ll'and, as these impellers rotate, there will'be a variation of applied force approximating thevariation of resistance of each impeller and consequently the transfer of driving torque from one shaft to the other through the synchro-. nizing gears will be a minimum, such transfer being entirely eliiniinite'd if the power curve of the motor unitwere the same as the resistance eurvo ofqhe impeller. Practically the two curves do not absolutely correspond. but they so closely apprortimate that decidedly beneficial rcsult$ are obtained by Fly whee ls 25 will, of course, be provided upon each; crank shaft.

From [the above it will appear that,,because-tI Kefe is no material transfer of driving force m one. shaft to the other, the clea-rangi tween the lobes 0f the impellers maybe rd' tied to a minimum and, by havxiii-wing gears at each end of the hese" gears may be set against each other-$0 as to eliminate all back lash.

I claim as my invention I 1. The combination, with a pump or blower of the lobed impeller type having two impeller shafts, of two reciprocating motor units each having its crank connected to one of said impeller shafts in such manner that each motor will exert its maximum driving effect upon its impeller shaft ap-;

proximately at the time when the impeller thereof is ofi'ering its maximum resistance.

2. The combination with a pump or blower of the lobed impeller type comprising a pair of parallel shafts each carrying a two-lobed impeller and meshing synchronizing gears, of two power units each comprising a crank, each of said power units having its crank attached to one of the impeller-shafts substantially in the lobe plane.

3. The combination, with a pump or blower of the lobed impeller type having two impeller shafts with a two-lobed impeller on each shaft, the impellers on the two shafts'intermeshing to produce on each impeller a gradually varying effective radius arm exposed to the fluid action, of two reciprocating motor units each having its crank connected to one of such impeller shafts in such manner that its driving effect on the impeller shaft rises and'falls substantially synchronously with the resistance offered by the impeller.

4. The combination, with a pump 0 blower of the lobed impeller type comprising a pair of parallel impeller shafts 'each v carrying a two-lobed impeller, and intermeshing synchronizing gears connecting said two shafts, the impellers on .the two shafts intermeshing to produce on each impeller a gradually varying efl'ective radius arm exposed to the fluid action, of two power units,

each of said power units having its crank attached to one of the impeller shafts so that the crank arm is substantially on dead center when the lobe plane of the impeller on such impeller shaft coincides with the plane of the two impeller shafts.

5. The combination, with a. pump or blower of the lobed impeller type having two impeller shafts with a two-lobed impeller on eachshaft, the impellers on the two shafts intermeshing to produce on each impeller a gradually varying effective radius arm exposed to the fluid action, of two reciprocating steam engines each having ,its crank mounted on one of said impeller shafts in such a manner that when the steam engine is exerting its maximum force on such crank the associated impeller will be offering its maximum resistance.

6. The combination, with a pump or blower of the lobed impeller type comprising a pair'of parallel impeller shafts each carrying a two-lobed impeller, and intermeshing synchronizing gears connecting said two shafts, of two reciprocating fluid pressure motor units each having a crank,

the cranks of said two units being mounted JOHN. T. WVILKIN.

respectively on two impeller shafts and each 

